Book sewing machine having reversing book clamp and transport slide

ABSTRACT

Book making machine featuring a reciprocating book clamp and transport slide for conveying a book with its spine down to a saw station and a downstream sewing station to saw dove-tailed slits across the book spine to form a book cleat and then lace thread through the pages of the cleat. This machine provides for the cleat forming and sewing in a single pass of the book clamp and transport slide between a home position upstream of the saw station and a reversing station downstream of the sewing station.

United States Patent [191 Sanderson 1 BOOK SEWING MACHINE HAVING REVERSING BOOK CLAMP AND TRANSPORT SLIDE [75] Inventor: Guy L. Sanderson, Glastonbury,

Conn.

[73] Assignee: The Smyth Manufacturing Company, Bloomfield, Conn.

[22] Filed: May 24, 1973 [21] Appl. No.: 363,667

[52] US. Cl. 112/21 [51] Int. Cl B42b 1/02 [58] Field of Search 11/1 R, 1 CP; 112/21, 22

[56] References Cited UNITED STATES PATENTS Crawford 112/21 Mar. 19, 1974 3.591183 7/1971 Stoothoff 112/21 Primary Examiner-Geo. V. Larkin Attorney, Agent, or Firm-Prutzman, Hayes, Kalb & Chilton [57] ABSTRACT Book making machine featuring a reciprocating book clamp and transport slide for conveying a book with its spine down to a saw station and a downstream sewing station to saw dove-tailed slits across the book spine to form a book cleat and then lace thread through the pages of the cleat. This machine provides for the cleat forming and sewing in a single pass of the book clamp and transport slide between a home position upstream of the saw station and a reversing station downstream of the sewing station.

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PATENTEDIIAR 1 9 I974 37973121 SIIEEI 2 0F 2 DOGS I22 AND I24 ARE NORMALLY EXTENDED FOR DOGGING OF SLIDE RACK I26.

AIR CLUTCH 40, H6. 2 NORMALLY DISENGAGED.

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25 Q LW, M5 Z2 ELECTRICAL) VALVE I CONTROL BQX JUNCTION STACK H6 3 BOX BOOK SEWING MACHINE HAVING REVERSING BOOK CLAMP AND TRANSPORT SLIDE This invention relates generally to book making machinery and particularly concerns a machine for forming so-called cleats in a book spine and for lacing thread through the pages of each cleat so formed between its end sheets.

A primary object of this invention is to provide a book sewing machine which features a new and improved reversing book clamp and transport slide.

Another object of this invention is to provide a machine of the above described type which also incorporates a saw head of a reciprocating type which provides for forming cleats in a book spine in each of its opposite directions of movement to effecta sawing action on each stroke of the saw head.

A further object of this invention is to provide a book sewing machine which is rugged in construction, provides for improved rigidity of the transport slide and long term accuracy in its positioning, lends itself to ease of service and is relatively economical to manufacture and assemble.

Other objects will be in part obvious and in part pointed out in more detail hereinafter.

A better understanding of the objects, advantages, features, properties and relationships of the invention will be obtained from the following detailed description and'accompanying drawings which set forth an illustrative embodiment and are indicative of the way in which the principle of the invention is employed.

In the drawings:

FIG. 1 is a top plan view of a machine incorporating this invention, with certain parts not shown for the sake of clarity;

FIG. 2 is a partial isometric view schematically showing certain drive components of the machine of FIG. 1;

FIG. 3 is a top plan view of the machine of FIG. 1 schematically showing certain significant components and controls; and

FIG. 4 is a diagrammatic illustration of the operation of the machine during the advance of its book clamp and transport slide through a saw station of the ma chine.

Referring in detail to the drawings, a preferred embodiment of this invention is shown in so-called cleat sewer machine wherein loose pages of a book 12 will be understood to be loaded at the illustrated home position (FIG. 1) of a book clamp and transport slide 14 to be fed through a saw station 16 and a sewing station 18. Upon emerging from sewing station 18 in an advancing direction of movement away from the slide home position, book 12 is further advanced by slide 14 to an extreme limit position at a reversing station 20 downstream of sewing station 18 and subsequently returned to home position for unloading of the sewn book. It will be understood that book 12 is disposed in slide 14 in a so-called spine down position for movement in a plane overlying the saw and sewing stations 16 and 18 and is transported through such stations in a direction parallel to the spine of the book.

Book clamp and transport slide 14 is provided suitable bearing support on a pair of spaced parallel shafts 22 and 24 extending lengthwise of a rectilinear base or frame 26 of the machine 10 with opposite ends of each shaft 22, 24 being mounted on end plates 28 and 30 of the frame 26. To effect reciprocating movements of slide 14 on its supporting shafts 22, 24, slide 14 is linked by any suitable coupling means such as link 32 to a transport or drive chain 34 trained over suitable sprockets 36 and 38 supported for rotation on suitable shafts 37 and 39 mounted on the machine frame 26 with sprocket 36 serving as a drive sprocket for the chain 34. Drive sprocket 36 is fixed on shaft 37 to be selectively driven responsive to energization of a conventional air operated clutch 40 for engaging and disengaging shaft 37 with an input sprocket 42 connected by chain 44 to a drive sprocket 46 on an output shaft, not shown, of a gear box 48 of a reversible electric motor M-l. A second drive sprocket 50 is provided as an output from gear box 48 and is connected by drive chains 52 and 54 through an idler sprocket coupling 56 for rotating an input sprocket 58 mounted on a cam shaft 60 of a sewing head 62 at sewing station 18. Cam shaft 60 is provided with a conventlonal electric clutch and brake unit 64 for controlling cam shaft rotation and the operation of sewing head 62.

Book clamp and transport slide 14 has fixed thereon a stationary jaw 66 and a movable jaw 68 connected to an extendible and retractable piston rod 70 of an operating cylinder 72 which may be operated by a suitable solenoid valve, not shown, for selectively opening and closing clamping jaws 66 and 68 to permit book loading and unloading at the home position of slide 14. If de sired, the solenoid valve controlling the clamp operating cylinder 72 may be suitably operated by a spring centered two position foot switch 74 which will be understood to be connected between the valve solenoid for operating clamp cylinder 72 and a suitable source of electrical power, not shown, to extend and retract cylinder piston rod 70.

For purposes of explanation, each of the various power cylinders for operating the machine components will be understood to be connected to a suitable source of pressurized fluid such as compressed air through solenoid control valves which are shown stacked in modular fashion adjacent an electrical junction box in a corner of the machine frame 26; suitable piping, not shown, is of course connected from the air source to each valve in the stack and to each of the cylinders. It will also be understood that the solenoid controls for operating the cylinder valves are likewise connected to a suitable source of electric power through electric circuitry, preferably housed in the junction box and main control box, with microswitches being provided in the circuitry for operating the valve controls in desired timed relation to the machine operation. Certain switches are specifically noted below so as to aid in a full understanding of this invention.

A saw traversing cylinder 76 is illustrated at the saw station 16 for controlling reciprocation of saw head 78 in a direction normal to the path of movement of slide 14 for sawing slits laterally of the book spine in mutually inclined dovetail fashion to form a so-called cleat in the book spine. For this reason, saw head 78 is provided with rotary front and rear saw blades 80 and 82 shown disposed at opposite angular inclinations to be driven by motors M 2 and M-3. Cylinder 76 has an extendible and retractable piston rod 84 connected to a bracket 86 fixed at a side of saw head 78 to effect reciprocating traversing movements of saw head 78 on parallel cross shafts 88 and 90 secured in spaced apart relation to side plates 92 and 94 of the machine frame 26.

Downstream of saw station 16 is sewing station 18 wherein a spindle frame 96 is fixed to machine frame 26 to support a spindle carriage 98 for movement laterally of the path of movement of slide 14 responsive to operation of a double-acting spindle cylinder 100 controlled by a suitable four-way valve 102. Spindle cylinder 100 cooperates with a spindle cam 104 and an escapement, not shown, to intermittently feed carriage 98 and its cam drive assembly 106 in unison transversely or crosswise of the book spine on a supporting shaft 108 and the cam shaft 60 both of which are suitably mounted on the carriage frame 96.

Sewing head 62 has a needle rod 110 operatively mounted on a spindle 112 for effecting needle movement relative to the book spine responsive to spindle cylinder 100 and cam shaft 60. Upon rotation of cam shaft 60, the cam drive assembly 106 and its driving connections to needle rod 1 provide a complex compound motion for progressively sewing each cleat in the book spine in successive sections proceeding crosswise across the spine of the book, preferably in a progressive series of FIG. 8 patterns as fully described in US. Pat. application Ser. No. 363,666, filed May 24, 1973 in the name of Daniel I. Streeter for a Thread Overwrap Mechanism and assigned to the assignee of this invention. The disclosure of the referenced United States application is incorporated herein by reference. However, for an understanding of this invention, it is sufficient to realize that sewing head 62 progressively laces thread in an advancing repetitive pattern across each cleat formed by saw head 78.

The following summary of machine operation does not specifically describe certain details of various controls, electric circuitry and piping arrangements of the machine and its control box which have been found to perform satisfactorily, for a variety of different circuits and controls may be employed in accordance with conventional techniques to effect machine operation on manual, semi-automatic or automatic program sequencing. A clear understanding of this invention will be obtained from the following description of the sequence of operation of the mechanical components of the machine with reference to the drawings.

Upon loading loose pages of a book between jaws 66 and 68, and depressing the power on and motor start buttons, slide traverse motor M-l will run in reverse, assuring that book clamp and transport slide 14 is in its illustrated home position, and will also start saw motors M-2 and M-3 and cause sewing head 62 to return to its illustrated home position if it is not already there. Spring centered two-position foot switch 74 may then be operated to close movable jaw 68 to clamp book 12 when limit switch lLS is closed by slide 14 in home position.

The cycle start button is then actuated to reverse motor M-l for driving chain 34 in a direction causing slide 14 to advance toward saw station 16. This movement of the slide 14 occurs when both saw head 78 and sewing head 62 are in their illustrated full line or home positions, closing sensor switches 3L8 and 4LS by saw head 78 and sewing head 62, respectively, to energize a solenoid 119 to operate valve 120 to cause engagement of air clutch 40 to permit slide advance to saw station 16.

A suitable conduit 114 is connected between normally disengaged air clutch 40 and a pair of normally extended slide dogging cylinders 116 and 118 to positively pressurize and engage clutch 40 upon energizing the solenoid 119. Upon being pressurized, the air clutch 40 will be understood to be so designed to effect clutching engagement between its shaft 37 and sprocket 42, which is driven by motor M-l, to rotate sprocket 36 and drive the chain 34. Dogging cylinders 116 and 118 respectively control extendible and retractable dogs 122 and 124 on piston rods of the cylinders 116 and 118 for engagement with a rack 126 on slide 14 when it is moved into position in the saw station 16 and sewing station 18, respectively.

More specifically, arrival of the book 12 at the saw station 16 is sensed by switch SLS which is contacted by the first of a series of sensing pins such as at 128, carried by the fixed jaw 66 of the slide 14, to deenergize valve control solenoid 119 to disengage the air clutch 40 and to operate dogging air cylinder 116 to dog the slide 14 at the saw station 16 and close switch 7LS upon dogging of slide 14 to in turn cause saw traversing cylinder 76 to operate to traverse the saw head 78. Movement of saw head 78 from its full line home position across the book spine effects sawing of a pair of slits in the book spine to form the cleat and to trip switch 6LS at the end of the saw stroke to re-energize the soleniod 119 controlling valve 120 to engage air clutch 40 and undog slide 14 to permit advance of chain 34 to index slide 14 to its next position responsive to the next following sensing pin 128 carried by slide 14, re-engaging switch SLS. Thisagain de-energizes solenoid 119 of valve 120 to disengage the clutch 40 and to dog the slide 14, providing precision accuracy in locating the slide 14 for the next cleat forming operation. It will be noted that the length of the saw stroke may be adjusted by repositioning switch 6LS On shaft in a desired preselected position.

In accordance with still another feature of this invention, idle return of the saw head 78 may be eliminated by energizing its operating cylinder 76 with its air connections reversed by a suitable solenoid operated valve upon each closing of switch 7LS responsive to dogging of slide 14, if desired, whereupon operating cylinder 76 causes saw head 78 to-traverse in a reverse direction on each successive saw stroke following an advance of the slide 14 through the saw station 16 to provide significantly improved operating speeds in the disclosed cleat forming operation.

Further cleats are sawed as required on successive traversing movements of saw head 78 during each indexing dwell of the slide 14 as described above responsive to the interlocking function performed at the saw' station 16 by the dogging cylinder 116 and associated controls. Following each intermittent advance of slide 14 through saw station 16, the saw head 78 traverses in a direction opposite its previous saw stroke, and upon completion of each saw stroke the slide 14 is undogged and the air clutch 40 is again engaged to index the slide 14 to the next cleat sawing position in the saw station, as clearly set forth in the diagrammatical illustration in FIG. 4 of the machine operation through saw station 16.

After the last cleat is sawed, the sensing pins on the slide 14 will be disposed downstream of the switch SLS which therefor will not be tripped upon further advance of the slide 14. Slide 14 then closes switch 14LS to move the saw head 78 to its home position, and the slide 14 advances to the sew station 18 and the leading sensor pin 128 trips switch 8LS to momentarily close that switch (which operates similarly to SLS) to deenergize solenoid 119, disengage air clutch 40 and dog slide 14 in position in the sewing station 18 by the extension of dog 124 into engagement with slide rack 126 by clogging cylinder 1 18 for precision locating and sewing of the first cleat formed in the book spine.

With dog 124 extended to interlock slide 14, switch 11LS is closed to cause sewing head 62 to be traversed by its operating cylinder 100 across the spine of the book in a feed direction extending from the fixed jaw 66 toward the movable jaw 68 to provide the previously mentioned progressive lacing of thread across the cleat by the motion imparted to needle rod 110 by the sewing head 62 in an advancing repetition pattern.

Near the end of the sewing traverse, switch 9LS on spindle carriage 98 contacts an actuactor 130 mounted on spindle frame 96 to commence termination of sewing of the cleat, as described in the above referenced United States patent application, and thereafter reverses the spindle operating cylinder 100 to return sewing head 6 to home position and closes switch 4L5 which also operates to energize solenoid 119 to undog the slide 14 and engage the air clutch 40 to again advance the chain 34 to position the book 12 for sewing its next cleat upon switch 8LS being actuated by the next sensing pin 128 carried by slide 14. The above described sewing cycle is thereafter repeated until all cleats are sewn as required. The chain 34 then moves slide 14 out of the sewing station 18 when switch 8LS is no longer closed upon slide advance, and switch 2LS is engaged by slide 14 at the reversing station 20 to deenergize and thereafter reverse motor M-1 through suitable circuitry, not shown, and with both the saw and sewing heads 78 and 62 in home position, closing switches 3LS and 4LS, air clutch 40 is pressurized to return slide 14 to home position, whereupon switch 1LS opens to disengage the clutch 40 and permit removal of the book and repeat of the cycle.

From the above description, it will be seen that various modifications may be adopted in implementing the principle ofthis invention. The sensing pins 128 are preferably mounted in spaced linear relation in the jaw 66. The pins 128 may be so arranged as to be normally retracted under spring bias within the jaw 66 in noninterfering relation to switches SLS and 8L8 so that books of varying spine length upon being clamped in slide 14, will cause only those pins 128 which are engaged by a clamped book to project from the jaw 66 for tripping the sensor switches SLS and 8LS. In addition, the control may also be modified to selectively permit a reciprocating saw stroke during each dwell of the indexing drive at the saw station, if necessary for any reason. By virtue of the disclosed reversing book clamp and transport slide arrangement, improved visibility of the book cleat forming and sewing operations are achieved, and the structural arrangement is particularly suited for ease of .manufacture and assembly with a minimum number of required drive and control components which also provide increased rigidity of the frame supporting the operating elements for improved accuracy and stability of the machine during operation.

As will be apparent to persons skilled in the art, various modifications, adaptations and variations of the foregoing specific disclosure can be made without departing from the teachings of the present invention.

I claim:

1. A book sewing machine for'sawing a pair of lateral slits in a spine of a book at a saw station and for sewing the pages between the slits at a downstream sewing station in a single pass of the book through the machine comprising a base, a book clamp and transport slide, guide means on the base supporting the book clamp and transport slide for reciprocating movement between a home position upstream of the saw station and a reversing position downstreamof the sewing station, the guide means defining a planar path of movement between said home and reversing positions for a book spine carried by the slide, a saw head at the saw station for sawing a pair of lateral slits in the book spine, a sewing head at the sewing station in aligned downstream relation to the saw station, the sewing head having needle means for lacing thread through the slits formed in the book spine, and an indexing drive for moving the book clamp .and transport slide between the home and reversing stations.

2. The machine of claim 1 wherein the saw head is supported on the base for reciprocating movement nor mal to the path of slide movement between first and second saw head positions disposed on opposite lateral sides of a book spine conveyed by the slide, and wherein the sewing head is supported on the base for reciprocating movement normal to the path of slide movement between first and second sewing head positions disposed on opposite lateral sides of a book spine conveyed by the slide.

3. The machine of claim 1 wherein the saw head is supported on the base for reciprocating movement normal to the path of slide movement, and wherein reciprocating drive means is connected to the saw head for driving it during a dwell of the indexing drive positioning the slide at the saw station for sawing a cleat in the spine of the book, the drive means being operable to drive the saw head in opposite directions in alternating following sequence to each advance movement of the slide through the saw station by the indexing drive to effect sawing of a separate pair of slits in the book spine on each successive saw stroke.

4. The machine of claim 3 wherein the slide upon advance slide movement from home position to the saw station operates releasable interlocking means for positively interlocking the slide during a dwell of the indexing drive and at the time the drive means is operating the saw head.

5. The machine of claim 4 wherein the saw head releases the interlocking means upon completion of a saw stroke to permit the indexing drive to advance the slide through the saw station.

6. The machine of claim 1 wherein the slide upon advance slide movement from the saw station to the sewing station operates releasable interlocking means for positively interlocking the slide during a dwell of the interlocking drive and at the time of sewing head operation.

7. The machine of claim 6 wherein the sewing head releases the interlocking means upon completion of the sewing cycle to permit the indexing drive to advance the slide through the sewing station.

8. The machine of claim 1 wherein the book clamp and transport slide, the saw head and the sewing head are each supported for reciprocation on a pair of support shafts mounted on the base.

9. The machine of claim 1 wherein the indexing drive includes a reversible motor and a driving connection including a disengageable clutch between the motor and the slide to effect indexing movements of the slide in an advancing direction from its home position toward its reversing position.

10. The machine of claim 9 further including drive means for the sewing head, the sewing head drive means including a feed cylinder for reciprocating the sewing head normal to the path of slide movement, a cam shaft for operating the sewing head and a driving connection between the indexing drive motor and the sewing head cam shaft, the cam shaft having brake and clutch means mounted thereon for controlling cam shaft rotation during the operation of sewing.

11. The machine of claim 1 further including releasable interlocking means at the same station and at the sewing station for positively interlocking the slide during a dwell of the indexing drive, and wherein the indexing drive includes a disengageable clutch, the disengageable clutch being operatively connected to the interlocking means at the saw station and sewing station, and sensing means on the slide engageable with the interlocking means to disengage the clutch and operate the releasable interlocking means for positively interlocking the slide at the saw station and at the sewing station during operation respectively of the saw head and sewing head.

12. A book sewing machine for sawing a pair of lateral slits in a spine of a book at a saw station and sewing pages between the slits at a downstream sewing station in a single pass of the book through the machine comprising a base, a book clamp and transport slide, guide means on the base supporting the book clamp and transport slide for reciprocating movement between a home position upstream of the saw station and a reversing position downstream of the sewing station, an indexing drive for moving the book clamp and transport slide between the home and reversing stations, a reciprocable saw head at the saw station supported on the base for movement normal to the path of slide movement, a sewing head at the sewing station supported for movement on the base, and first and second reciprocable drive means for respectively driving the saw head and the sewing head during a dwell of the indexing drive positioning the slide at their respective stations, the drive means for the slide head being operable to drive the saw head in opposite linear directions in alternating following sequence to each advancing slide movement through the saw station by the indexing drive to effect sawing of a separate pair of slits in the book spine on each successive saw stroke.

13. The machine of claim 12 further including releasable interlocking means at the saw station and at the sewing station, and wherein the slide upon advance slide movement from home position to reversing position operates the interlocking means for positively interlocking the slide during a dwell of the indexingdrive and at the time the first and second drive means operates the saw head and sewing head respectively.

14. The machine of claim 13 wherein the indexing drive includes a reversible motor and a driving connection between the motor and the slide including a disengageable clutch, the disengageable clutch being operatively connected to the interlocking means at the saw station and sewing station, and sensing means on the slide engageable with the interlocking means to disengage the clutch and operate the releasable interlocking means for positively interlocking the slide at the saw station and at the sewing station during operation respectively of the saw head and sewing head.

Dated March 19 197 Patent No. 3 797 421 Inventor(s) GUY L; Sanderson It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Column 1, line 46, after "in" insert --a-; column 5, line 21, cancel "6" and insert 62--; column 7,

line 15, cancel "same" and insert -'saw-; column 8, line 10, cancel "slide" and insert "saw-- i Signed and sealed this 30th day of July. 197a.

(SEAL) Attest:

MCCOY M; GIBSON, JR. c. MARSHALL DANN Attesting Officer Commissioner of Patents E i n I i z g po'wso 9 UscoMM-oc 00370.:

J r w u.s. sovnuuun "mums omc: nu o-au-su. 

1. A book sewing machine for sawing a pair of lateral slits in a spine of a book at a saw station and for sewing the pages between the slits at a downstream sewing station in a single pass of the book through the machine comprising a base, a book clamp and transport slide, guide means on the base supporting the book clamp and transport slide for reciprocating movement between a home position upstream of the saw station and a reversing position downstream of the sewing station, the guide means defining a planar path of movement between said home and reversing positions for a book spine carried by the slide, a saw head at the saw station for sawing a pair of lateral slits in the book spine, a sewing head at the sewing station in aligned downstream relation to the saw station, the sewing head having needle means for lacing thread through the slits formed in the book spine, and an indexing drive for moving the book clamp and transport slide between the home and reversing stations.
 2. The machine of claim 1 wherein the saw head is supported on the base for reciprocating movement normal to the path of slide movement between first and second saw head positions disposed on opposite lateral sides of a book spine conveyed by the slide, and wherein the sewing head is supported on the base for reciprocating movement normal to the path of slide movement between first and second sewing head positions disposed on opposite lateral sides of a book spine conveyed by the slide.
 3. The machine of claim 1 wherein the saw head is supported on the base for reciprocating movement normal to the path of slide movement, and wherein reciprocating drive means is connected to the saw head for driving it during a dwell of the indexing drive positioning the slide at the Saw station for sawing a cleat in the spine of the book, the drive means being operable to drive the saw head in opposite directions in alternating following sequence to each advance movement of the slide through the saw station by the indexing drive to effect sawing of a separate pair of slits in the book spine on each successive saw stroke.
 4. The machine of claim 3 wherein the slide upon advance slide movement from home position to the saw station operates releasable interlocking means for positively interlocking the slide during a dwell of the indexing drive and at the time the drive means is operating the saw head.
 5. The machine of claim 4 wherein the saw head releases the interlocking means upon completion of a saw stroke to permit the indexing drive to advance the slide through the saw station.
 6. The machine of claim 1 wherein the slide upon advance slide movement from the saw station to the sewing station operates releasable interlocking means for positively interlocking the slide during a dwell of the interlocking drive and at the time of sewing head operation.
 7. The machine of claim 6 wherein the sewing head releases the interlocking means upon completion of the sewing cycle to permit the indexing drive to advance the slide through the sewing station.
 8. The machine of claim 1 wherein the book clamp and transport slide, the saw head and the sewing head are each supported for reciprocation on a pair of support shafts mounted on the base.
 9. The machine of claim 1 wherein the indexing drive includes a reversible motor and a driving connection including a disengageable clutch between the motor and the slide to effect indexing movements of the slide in an advancing direction from its home position toward its reversing position.
 10. The machine of claim 9 further including drive means for the sewing head, the sewing head drive means including a feed cylinder for reciprocating the sewing head normal to the path of slide movement, a cam shaft for operating the sewing head and a driving connection between the indexing drive motor and the sewing head cam shaft, the cam shaft having brake and clutch means mounted thereon for controlling cam shaft rotation during the operation of sewing.
 11. The machine of claim 1 further including releasable interlocking means at the same station and at the sewing station for positively interlocking the slide during a dwell of the indexing drive, and wherein the indexing drive includes a disengageable clutch, the disengageable clutch being operatively connected to the interlocking means at the saw station and sewing station, and sensing means on the slide engageable with the interlocking means to disengage the clutch and operate the releasable interlocking means for positively interlocking the slide at the saw station and at the sewing station during operation respectively of the saw head and sewing head.
 12. A book sewing machine for sawing a pair of lateral slits in a spine of a book at a saw station and sewing pages between the slits at a downstream sewing station in a single pass of the book through the machine comprising a base, a book clamp and transport slide, guide means on the base supporting the book clamp and transport slide for reciprocating movement between a home position upstream of the saw station and a reversing position downstream of the sewing station, an indexing drive for moving the book clamp and transport slide between the home and reversing stations, a reciprocable saw head at the saw station supported on the base for movement normal to the path of slide movement, a sewing head at the sewing station supported for movement on the base, and first and second reciprocable drive means for respectively driving the saw head and the sewing head during a dwell of the indexing drive positioning the slide at their respective stations, the drive means for the slide head being operable to drive the saw head in opposite linear directions in alternating following sequence to each advancing slide movement throuGh the saw station by the indexing drive to effect sawing of a separate pair of slits in the book spine on each successive saw stroke.
 13. The machine of claim 12 further including releasable interlocking means at the saw station and at the sewing station, and wherein the slide upon advance slide movement from home position to reversing position operates the interlocking means for positively interlocking the slide during a dwell of the indexing drive and at the time the first and second drive means operates the saw head and sewing head respectively.
 14. The machine of claim 13 wherein the indexing drive includes a reversible motor and a driving connection between the motor and the slide including a disengageable clutch, the disengageable clutch being operatively connected to the interlocking means at the saw station and sewing station, and sensing means on the slide engageable with the interlocking means to disengage the clutch and operate the releasable interlocking means for positively interlocking the slide at the saw station and at the sewing station during operation respectively of the saw head and sewing head. 